Vittobio peradotto



May -15, 1923. 1,455,655

V. PERADOTTO PROCESS OF'AND MEANS FOR TANNING HIDES Filed April 15. 1922Snow: lfo'c Vittorio Perado'trto Patented May 15, 1923.

VITTOBIO PERADOTTO, 0F GALLENCA, TURIN, ITALY.

PROCESS OF AND MEANS FOR TANNING HIDES.

Application filed April 15, 1922.

7 '0 all whom it may concern:

Be it known that I, Vrrronro PERADOTTO, manufacturer, a citizen of theKingdom of Italy, residing at Valperga, Gallenca, Turin, Italy, haveinvented certain new and useful Improvements in Process of and Means forTanning Hides, of which the following is a full, clear, and exactspecification.

This invention relates to an improved process for tanning hides andmeans to put it into practice, and has for its object to provide animproved basin or vat, allowing the hides and skins to be continuouslyand completely tanned, reducing the cost of manufacture and improvingthe results of the tanning process. I

According to the present invention the skins or hides are suspendedwithin the vat so that they hang in the tanning bath therein, the liquidbeing continuously put in rapid and strong motion thus carrying away thetanning solid matters in suspension in the bath.

One of the characteristic features of the tanning process according tothe present invention consists in the fact that heating does not form aconstituent element of the process, while by the tanning processesheretofore used the baths have been heated to a suitable temperature, ofabout 38-40 C. On the contrary, the tanning bath referred to in thisinvention needs only to be heated during the winter, and it does nothave to be heated in winter, even, if there is no danger of the liquidbath freezing.

' I the accompanying drawings there is shown by way of example astructural form of vat having the characteristic features of the presentinvention, but it will be understood that in actual practice the shapeand dimensions may vary without departing from the principle of thepresent invention.

Figure 1 is a plan view of the vat.

Figure 2 a longitudinal section on the line A-B of Figure 1, and

Figure 3 a transverse section taken on the line C-D of Figure 1.

The perimetric wall 1 of the vat, and the partition 2 which divides thevat longitudinally are both provided at their upper edge withprojections or ledges 3 upon which are supported the ends of the bars ortrans verse supports arranged transversely between the outer wall andthe partition. Upon these transverse bars there are supported,

Serial No. 553,112.

in the longitudinal direction of the vat, sticks upon which the hides tobe tanned are arranged in such a manner that they depend on both sidesof the sticks or as an alternative the hides may be hooked to thetransverse bars by means of hooks fitting into small chains of suitabletype; Either sticks or chains with their hooks are completely immersedbelow the level of the bath. Thus suspended, below the level of theliquid in the vat, the hides hang down and are completely immersed inthe liquid itself.

At one of the ends of the vat, or it may be at any suitable point, thereis mounted upon a shaft 4 a vane wheel 5 or any other suitable agitatoror beater such a screw for instance. The said shaft may be placed inmotion by means of the necessary pulleys, through a driving shaft 6. Theheater dips to a sufficient extent in the bath producing the tannage, orit may also be completely immersed therein so that its rotation sets upin the bath itself a continual circulation, for instance in thedirection indicated by the arrows 7. y

The circulatory movement of the liquid, which takes place in thelongitudinal direction of the vat, imparts a continual shaking andoscillating movement of the hides, suspended in the same direction andaccelerates the tanning action of the bath.

Differing from the other tanning systerns hitherto employed, thecirculatory movement of the tanning liquid in the present system is sorapid that the li uid carries away the fragments and waste its of'barkwhich are found in the bath and which add their mechanical scrapingaction to the chemical effects of the tanning bath. In the vat accordingto the present invention the liquid may attain the speed of metres perminute whilst, in other systems, the speed of circulation is very small.

This type of vat is adapted to be subdividecl into several parts, so asto reduce the capacity thereof. To this end the partition wall may haveone or more interruptions or openings 8 extending over the whole heightof the said wall. Upon a pillar or prop of these openings as at 9, theremay be pivoted the doors 10 which, turning in the direction indicated bythe arrow 11 (Figure 1) can be turned round against the opposite pillar12, thus forming a continuation of the dividing wall 2. If, on

the contrary, they are allowed to remain in the position shown in thedrawing they restrict the circulation of the bath in the vat at theportion which is comprised between them and the agitator thus reducing"its capacity, in relation to the point oi the dividing wall in which theopening; under consideration is made. This step is necessitated when itis desired to limit working to one part of the vat only, in orde toempty and dry one or more of the other sections.

In order to facilitate working the said doors may also he replaced bymovable partitions of any other nature, by suitably modifying therelative supports in the pillars andin the outer wall of the vat. Duringthe winter this type of vat may be provided with circulatory heatingelement arranged along the bottom of the walls, for example, so as toraise the temperature of the bath above the natural temperature,although heat does not come into consid eration as a constituent elementof the tern at present set forth. it may fin ally he remarked that withtanning carried out according to the present invention the use, of anysubsidiary tanning}; tub is avoided as this operation is completely c;ied out in the one vat owing to the speed and continual. movement of thetanning' liquid and of the solid matter held in suspension therein. i

/Vhat'l claim is:

1, The combination with a hide-tanning vat adapted to contain anunheated tanning; liquid'and having a perimetric wall, oi

means for maintaining a rapid and contin uous circulation of theunheated tanning liquid, a central partition extending longitudinally ofthe vat and terminating short of the ends thereof, and provided with anopening intermediate its length, and means for normally closing saidopening, said closing means, when opened, contacting with saidperimetric Wall and thereby restricting circulation of the liquid to aportion only oi? the vat.

The combination with a hide-tanning vat adapted to contain an unheatedtanning liquid and'having a perimetric an, oi means for maintaining arapid and continuuous circulation of the unheated tanning liquid, acentral partition extending lonitudinally. of the vat and terminatingshort of the ends thereof, and provided with an opening intermediate itslength, and doors hinged to said partition at one end of said openingtherein and normally closed to permit circulation of the liquidthroughout the entire length of the vat, said doors, when opened,contacting with said perimetric wall and thereby restricting circulationoi the liquid to a portion only of the vat.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

VITTORIO PERADOTTO. Witnesses:

GinLio Siicnnno'rr, Umnnn'ro FBANUSCUNI'.

